Process of treating materials to render them waterproof.



UNITED STATES ALPHEUS HUGH HIPPLE,

PATENT OFFICE.

OF OMAHA, NEBRASKA.

PROCESS OF TREATING MATERIALS TQ RENDER THEM WATERPROOF.

SPECIFICATION forming part of Letters Patent No. 694,859, dated March 4,1902.

Application filed July 30, 1900. Serial No. 25,324. (No specimens.)

To (LZZ whom, it may concern:

Be it known that I, ALPHEUS HUGH HIPPLE,

of Omaha, in the county of Douglas and State of Nebraska, have inventeda new and useful.

Improvement in the Manufacture of Waterproof Asbestos, of which thefollowing is a specification.

In rendering asbestos waterproof I ineorporate with it a sufficientquantity of oil to render it impermeable to water and then fix this oilby vulcanization, for which purpose I add sulfur to the oil andincorporate it with the oil and asbestos, as hereinafter described. Thematerial is compressed by suitable means.

I incorporate about sixty parts, by weight, of linseed-oil and twelveparts, by weight, of flowers of sulfur with one hundred parts, byweight, of asbestos and vulcanize the mass thus obtained at atemperature of about 300 Fahrenheit for a period of time-say two hours.

The proportions of the materials and the length of time they are to bevulcanized may be varied Within certain limits.

Any form of asbestos which is capable of absorbing or of having oil andsulfur incorporated with it may be used.

If asbestos fiber is used, forinstance, it may be mixed into a mass withthe other ingredi-' cuts and be pressed or molded into any desired formand then be vulcanized under pressure.

Asbestos millboard or sheets may have the other materials incorporatedwith it by passing it through rollers and be vulcanized in the form ofcompressed sheets.

Other forms of asbestos may be treated in a similar manner, an ordinarysteam-Vulcan ALPHEUS HUGH HIPPLE.

Witnesses:

GEORGE W. SUEs, ETHEL SMITH.

